Add version subcomand to wsl-helper

Closes #5808

Signed-off-by: Carlos Barcenilla <[email protected]>

src/go/wsl-helper/cmd/version.go

@@ -0,0 +1,42 @@
+/*
+Copyright © 2022 SUSE LLC
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+const (
+	wslHelperVersion = "1.0.0"
+)
+
+// showVersionCmd represents the showVersion command
+var showVersionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "Shows the wsl-helper version.",
+	Long:  `Shows the wsl-helper version.`,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		_, err := fmt.Printf("wsl-helper version: %s\n", wslHelperVersion)
+		return err
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(showVersionCmd)
+}